微咸水矿化度对土壤水盐运移的影响研究

日益短缺的淡水资源严重影响着工农业生产，开发、利用微咸水进行农田灌溉具有重要意义。本文通过微咸水室内一维垂直入渗试验，研究了钠吸附比（SAR）相同条件下，矿化度单一指标对土壤水盐运移特征的影响。结果表明土壤导水和持水能力随入渗水矿化度的增加而增大．矿化度大于3g／L时，增加幅度减小；土壤含盐量随入渗水矿化度的增加明显增大，矿化度大于3g／L时，土壤基本处于积盐状态；不同矿化度水入渗后5～40cm土层土壤浸提液SAR均小于入渗水钠吸附比8，但大于土壤浸提液初始钠吸附比。因此在此种土壤理化条件下，入渗水SAR为8h，矿化度为3g／L是土壤安全灌溉的上限。

Effect of the Salinity of Slightly Saline Water on Soil Salt-water Transfer

The increasing problem of fresh water shortage influences the development of industry and agriculture severely. Exploitation and utilization of saline water for surface irrigation are of great importance. Through one dimension vertical infiltration laboratory experiments in soil, it was conducted to study soil salt--water transfer under same SAR and different saline wa- ter infiltration. It was showed that soil hydraulic conductivity and water holding capacity increased with the concentration of in- filtration solution. When the concentration was greater than 3 g/l, the increase rate reduced. The soil salt content increased with the concentration of infiltration solution obviously. When the concentration was greater than 3 g/l, salt accumulation ap- peared on the soil profile, salt concentration increased clearly. With different concentration of infiltration solution, soil leaching liquor in 5- 40 cm horizon was less titan SAR of infiltration water and greater than SAR of initial soil leaching liquor. When SAR of infiltration solution was 8 h, 3 g/l was the upper limit of concentration for safe irrigation.